From left: John Anker Bow, Daniel Vissers, David Murgittroyd and Robert Farruggia in 'Forever Plaid.'

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During that period, pop charts abounded with close-harmony male quartets. They were almost invariably white and white-bread, almost indistinguishable. Even their names were similar: the Four Freshman, the Four Aces, the Four Lads, et. al.

Rock 'n' roll effectively ended that musical fad. But the era is revived in "Forever Plaid." Since its debut off-Broadway in 1990, this sweetly satiric musical revue has won fans around the country. ...